Commit 62495d77 authored by Rishabh Bhatnagar's avatar Rishabh Bhatnagar Committed by Bjorn Andersson
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remoteproc: qcom: Add notification types to SSR 



The SSR subdevice only adds callback for the unprepare event. Add callbacks
for prepare, start and prepare events. The client driver for a particular
remoteproc might be interested in knowing the status of the remoteproc
while undergoing SSR, not just when the remoteproc has finished shutting
down.

Reviewed-by: default avatarAlex Elder <elder@linaro.org>
Signed-off-by: default avatarSiddharth Gupta <sidgup@codeaurora.org>
Signed-off-by: default avatarRishabh Bhatnagar <rishabhb@codeaurora.org>
Link: https://lore.kernel.org/r/1592965408-16908-3-git-send-email-rishabhb@codeaurora.org


Signed-off-by: default avatarBjorn Andersson <bjorn.andersson@linaro.org>
parent 5abfe5cf

drivers/remoteproc/qcom_common.c

+43 −1
Original line number Diff line number Diff line
@@ -265,6 +265,44 @@ int qcom_unregister_ssr_notifier(void *notify, struct notifier_block *nb) 
}

EXPORT_SYMBOL_GPL(qcom_unregister_ssr_notifier);



static int ssr_notify_prepare(struct rproc_subdev *subdev)

{

	struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);

	struct qcom_ssr_notify_data data = {

		.name = ssr->info->name,

		.crashed = false,

	};



	srcu_notifier_call_chain(&ssr->info->notifier_list,

				 QCOM_SSR_BEFORE_POWERUP, &data);

	return 0;

}



static int ssr_notify_start(struct rproc_subdev *subdev)

{

	struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);

	struct qcom_ssr_notify_data data = {

		.name = ssr->info->name,

		.crashed = false,

	};



	srcu_notifier_call_chain(&ssr->info->notifier_list,

				 QCOM_SSR_AFTER_POWERUP, &data);

	return 0;

}



static void ssr_notify_stop(struct rproc_subdev *subdev, bool crashed)

{

	struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);

	struct qcom_ssr_notify_data data = {

		.name = ssr->info->name,

		.crashed = crashed,

	};



	srcu_notifier_call_chain(&ssr->info->notifier_list,

				 QCOM_SSR_BEFORE_SHUTDOWN, &data);

}



static void ssr_notify_unprepare(struct rproc_subdev *subdev)

{

	struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
@@ -273,7 +311,8 @@ static void ssr_notify_unprepare(struct rproc_subdev *subdev) 
		.crashed = false,

	};



	srcu_notifier_call_chain(&ssr->info->notifier_list, 0, &data);

	srcu_notifier_call_chain(&ssr->info->notifier_list,

				 QCOM_SSR_AFTER_SHUTDOWN, &data);

}



/**
@@ -298,6 +337,9 @@ void qcom_add_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr, 
	}



	ssr->info = info;

	ssr->subdev.prepare = ssr_notify_prepare;

	ssr->subdev.start = ssr_notify_start;

	ssr->subdev.stop = ssr_notify_stop;

	ssr->subdev.unprepare = ssr_notify_unprepare;



	rproc_add_subdev(rproc, &ssr->subdev);

include/linux/remoteproc/qcom_rproc.h

+16 −0
Original line number Diff line number Diff line
@@ -5,6 +5,22 @@ struct notifier_block; 


#if IS_ENABLED(CONFIG_QCOM_RPROC_COMMON)



/**

 * enum qcom_ssr_notify_type - Startup/Shutdown events related to a remoteproc

 * processor.

 *

 * @QCOM_SSR_BEFORE_POWERUP:	Remoteproc about to start (prepare stage)

 * @QCOM_SSR_AFTER_POWERUP:	Remoteproc is running (start stage)

 * @QCOM_SSR_BEFORE_SHUTDOWN:	Remoteproc crashed or shutting down (stop stage)

 * @QCOM_SSR_AFTER_SHUTDOWN:	Remoteproc is down (unprepare stage)

 */

enum qcom_ssr_notify_type {

	QCOM_SSR_BEFORE_POWERUP,

	QCOM_SSR_AFTER_POWERUP,

	QCOM_SSR_BEFORE_SHUTDOWN,

	QCOM_SSR_AFTER_SHUTDOWN,

};



struct qcom_ssr_notify_data {

	const char *name;

	bool crashed;